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Diffstat (limited to 'tools/node_modules/eslint/lib/rules/one-var-declaration-per-line.js')
-rw-r--r-- | tools/node_modules/eslint/lib/rules/one-var-declaration-per-line.js | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/rules/one-var-declaration-per-line.js b/tools/node_modules/eslint/lib/rules/one-var-declaration-per-line.js new file mode 100644 index 0000000000..61b505c82d --- /dev/null +++ b/tools/node_modules/eslint/lib/rules/one-var-declaration-per-line.js @@ -0,0 +1,86 @@ +/** + * @fileoverview Rule to check multiple var declarations per line + * @author Alberto RodrÃguez + */ +"use strict"; + +//------------------------------------------------------------------------------ +// Rule Definition +//------------------------------------------------------------------------------ + +module.exports = { + meta: { + docs: { + description: "require or disallow newlines around variable declarations", + category: "Stylistic Issues", + recommended: false + }, + + schema: [ + { + enum: ["always", "initializations"] + } + ], + + fixable: "whitespace" + }, + + create(context) { + + const ERROR_MESSAGE = "Expected variable declaration to be on a new line."; + const always = context.options[0] === "always"; + + //-------------------------------------------------------------------------- + // Helpers + //-------------------------------------------------------------------------- + + + /** + * Determine if provided keyword is a variant of for specifiers + * @private + * @param {string} keyword - keyword to test + * @returns {boolean} True if `keyword` is a variant of for specifier + */ + function isForTypeSpecifier(keyword) { + return keyword === "ForStatement" || keyword === "ForInStatement" || keyword === "ForOfStatement"; + } + + /** + * Checks newlines around variable declarations. + * @private + * @param {ASTNode} node - `VariableDeclaration` node to test + * @returns {void} + */ + function checkForNewLine(node) { + if (isForTypeSpecifier(node.parent.type)) { + return; + } + + const declarations = node.declarations; + let prev; + + declarations.forEach(current => { + if (prev && prev.loc.end.line === current.loc.start.line) { + if (always || prev.init || current.init) { + context.report({ + node, + message: ERROR_MESSAGE, + loc: current.loc.start, + fix: fixer => fixer.insertTextBefore(current, "\n") + }); + } + } + prev = current; + }); + } + + //-------------------------------------------------------------------------- + // Public + //-------------------------------------------------------------------------- + + return { + VariableDeclaration: checkForNewLine + }; + + } +}; |